Blue Alfalfa Aphid and Egyptian Alfalfa Weevil Control on Alfalfa, 1981

Thirteen materials were applied to alfalfa Feb 18. Plants averaged 12 inches high and the field had been flood-irrigated Feb 15. Plots measured 8 ft x 150 ft with 4 replicates in a randomized block design. Applications were made with a small plot pressurized sprayer at the rate of 15 gpa using 40 psl. The boom was equipped with 5 TX-10 cone-jet nozzles at 20 inch intervals. Aphid and weevil counts were made by taking 10 stems at random per plot (10 x 4 = 40 stems). Stems were placed in a “specially-constructed” galvanized canister charged with ketone. Aphids comprised all motile stages and weevil counts were of larvae.